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Investments (Net Realized Gains (Losses) on Disposals) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Schedule of Realized Gains (Losses) on Disposals Excluding OTTI [Line Items]        
HTM fixed income securities Gains $ 0 $ 44 $ 2 $ 44
HTM fixed income securities Losses 0 0 0 (1)
Equity securities Gains 1,226   9,625  
Equity securities Losses 0   (330)  
Short-term investments Gains 2 0 3 2
Short-term investments Losses 0 0 (4) (2)
Other investments Gains 0 0 0 480
Other investments Losses 0 (5) 0 (19)
Net realized investment gains on disposals 54 2,951 4,785 5,381
Sale of fixed income securities, available-for-sale 262,900 122,300 938,276 717,072
Sale of equity securities 2,900   43,590  
Sale of equity securities, available-for-sale   800   6,289
Fixed Maturities [Member]        
Schedule of Realized Gains (Losses) on Disposals Excluding OTTI [Line Items]        
AFS fixed income securities Gains 1,971 2,715 4,594 6,267
AFS fixed income securities Losses (3,145) (153) (9,105) (1,740)
Equity Securities [Member]        
Schedule of Realized Gains (Losses) on Disposals Excluding OTTI [Line Items]        
AFS fixed income securities Gains   350   350
AFS fixed income securities Losses   0   0
Net realized investment gains on disposals $ 1,226 $ 350 $ 9,295 $ 350